I got to write this down this time although this is not related to Solr/Lucene. This has come back and bite me many times. The error is due to incorrect SELinux context on the DocumentRoot directory. Here is what you need to do to correct it:

chcon -R user_u:object_r:httpd_sys_content_t

You may want to check on /var/www first to see if the context is correct by issuing this command: